scholarly journals Graphene oxide and H2 production from bioelectrochemical graphite oxidation

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Lu Lu ◽  
Cuiping Zeng ◽  
Luda Wang ◽  
Xiaobo Yin ◽  
Song Jin ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
H2 Production ◽  
Graphite Oxidation

Ternary NiS/ZnxCd1-xS/Reduced Graphene Oxide Nanocomposites for Enhanced Solar Photocatalytic H2-Production Activity

2014 ◽  
Vol 4 (10) ◽  
pp. 1301925 ◽  
Author(s):  
Jun Zhang ◽  
Lifang Qi ◽  
Jingrun Ran ◽  
Jiaguo Yu ◽  
Shi Zhang Qiao
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
H2 Production ◽  
Reduced Graphene ◽  
Production Activity

A biomimetic self-assembled cobaloxime@CdS/rGO hybrid for boosting photocatalytic H2 production

2019 ◽  
Vol 55 (96) ◽  
pp. 14490-14493 ◽  
Author(s):  
Jun-Chao Hu ◽  
Shanshan Sun ◽  
Ming-De Li ◽  
Wu Xia ◽  
Jin Wu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Cobalt Catalyst ◽  
H2 Production ◽  
Reduced Graphene ◽  
Self Assembled

A biomimetic CoPe@CdS/rGO hybrid that self-assembles via the integration of a molecular cobalt catalyst and CdS nano-semiconductor on reduced graphene oxide was constructed for boosting photocatalytic H2 production.

scholarly journals Enhanced Photocatalytic Activity and Stability in Hydrogen Evolution of Mo6 Iodide Clusters Supported on Graphene Oxide

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1259
Author(s):  
Marta Puche ◽  
Rocío García-Aboal ◽  
Maxim A. Mikhaylov ◽  
Maxim N. Sokolov ◽  
Pedro Atienzar ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Gas Phase ◽  
Hybrid Material ◽  
Liquid Water ◽  
Catalytic Performance ◽  
H2 Production ◽  
Cluster Compound ◽  
Catalytic Systems ◽  
Active Cluster ◽  
First Time

Catalytic properties of the cluster compound (TBA)2[Mo6Ii8(O2CCH3)a6] (TBA = tetrabutylammonium) and a new hybrid material (TBA)2Mo6Ii8@GO (GO = graphene oxide) in water photoreduction into molecular hydrogen were investigated. New hybrid material (TBA)2Mo6Ii8@GO was prepared by coordinative immobilization of the (TBA)2[Mo6Ii8(O2CCH3)a6] onto GO sheets and characterized by spectroscopic, analytical, and morphological techniques. Liquid and, for the first time, gas phase conditions were chosen for catalytic experiments under UV–Vis irradiation. In liquid water, optimal H2 production yields were obtained after using (TBA)2[Mo6Ii8(O2CCH3)a6] and (TBA)2Mo6Ii8@GO) catalysts after 5 h of irradiation of liquid water. Despite these remarkable catalytic performances, “liquid-phase” catalytic systems have serious drawbacks: the cluster anion evolves to less active cluster species with partial hydrolytic decomposition, and the nanocomposite completely decays in the process. Vapor water photoreduction showed lower catalytic performance but offers more advantages in terms of cluster stability, even after longer radiation exposure times and recyclability of both catalysts. The turnover frequency (TOF) of (TBA)2Mo6Ii8@GO is three times higher than that of the microcrystalline (TBA)2[Mo6Ii8(O2CCH3)a6], in agreement with the better accessibility of catalytic cluster sites for water molecules in the gas phase. This bodes well for the possibility of creating {Mo6I8}4+-based materials as catalysts in hydrogen production technology from water vapor.

scholarly journals Reduction of Graphene Oxide: Controlled Synthesis by Microwave Irradiation

Molekul ◽  
2020 ◽  
Vol 15 (1) ◽  
pp. 56
Author(s):  
Endah Fitriani Rahayu ◽  
Bunnari Bunnari ◽  
Andri Hardyansyah
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Reduction Process ◽  
Controlled Synthesis ◽  
Microwave Exposure ◽  
Graphite Oxidation ◽  
Reduced Graphene ◽  
Infra Red ◽  
The Fourier Transform ◽  
Modified Hummers Method

Graphene has been attracting enormous attention in the scientific community because of its unique properties and use for various applications. Graphene has been synthesized in various ways, one of which is the graphite oxidation method to form graphene oxide (GO). Reduction of GO to reduced graphene oxide (RGO) is necessary to recover the conjugated network and electrical conductivity, and for this research, this was achieved using microwave irradiation. Microwave synthesis provides an alternative method, saving more time in the reaction process. In this research, graphene was synthesized from graphite by the modified Hummers method and microwave irradiation. This research proves that graphene can be synthesized with a high-quality structure and in a shorter amount of time using microwave irradiation to reduce GO. With longer microwave exposure, less GO is present in the sample, as indicated by the absence of an n–π* electronic transition in the absorbance graph and the absence of oxide groups in the Fourier-Transform Infra-Red spectrum. With increasing microwave power, the reduction process is short-lived, and better quality RGO is produced. This study shows that the new reduction process occurs within 20 minutes with a power of 450 and 630 watts, but at 900 watts, the reduction of GO occurs within 10 minutes, as shown by UV-Vis and FTIR spectra.

Sign in / Sign up

Export Citation Format

Share Document